TRANE
R
Maintenance
Direct expansion coils
Never use hot water or steam to clean
these coils. During normal opeartion,
the fin block must not ice up. If this
occurs, check the refrigeration system.
Refrigerant coils should be kept clean
to maintain maximum performance. If
fins become dirty, clean with cold water
and detergent or one of the
commercially available chemicals coil
cleaners. Rinse coils thoroughly after
cleaning.
7. Coil Winterization
Provisions must be made to drain
those coils that are not in use when
subjected to freezing temperature.
To drain these coils, blow out the coils
with compressed air, fill and drain the
tubes with full-strength ethylene glycol
several times, and then drain the coil
as completely as possible.
30
8. Pulley and Belt
Proper installation techniques will
assure that you get full service life and
minimum down time from your belt
drives.
1. Turn machine OFF and lock out
power source.
2. Remove belt guard, loosen motor
mounts and shorten center distance
between pulleys. Remove old belts.
3. lnspect. Repair or replace drives
components.
• Clean oil, grease and debris from
pulleys, remove rust with wire
brush.
• lnspect and replace damage
pulleys. Get your moneys worth
from a new set of belts by checking
and replacing worn or damaged
pulleys. ln the long run,
replacement pulley cost will more than
be recovered in increased belt life,
reduced downtime, and lower
maintenance expenses.
Check following:
a) Worn groove sidewalls, "Dishing"
should not exceed 1/32"(0.8mm) for
individual belts. With a banded belt,
dishing should not exceed 1/
64"(0.4mm). When a banded belt
rides too low in worn pulley
grooves the tie band can be cut by
the flanges between the grooves.
b) Shiny pulley groove bottoms. This
is a sure sign that the belt has
bottomed out. The resulting
slippage shortens belt life.
c) Wobbling and/or damaged pulleys.
Generally caused by improper
pulley or bushing installation,
wobbling and/or damaged pulleys
can unbalance a drive, wear out
belt rapidly, and damage bearings
and bend shafts.
Check and repair worn bearings and
bent shafts.
4. Select replacement belts.
Replace all belts on a drive with a new
matched set.
a) Do not mix old and new belts on a
drive. A new belt will ride higher in
the pulley groove and operate at a
higher tension than an old belt.
Running them together will
damaged the new belt as it cannot
carry its share of the load.
b) Do not mix belt from different make,
because dimensions and
constructions will vary running such
"Mis-Matched" belts will not give full
service life.
c) Replace with correct type and cross
section belt. Matched SPA section
belt with SPA section pulleys. Do not
put a SPA belt section on a SPB
section pulley. Also dimensionally
similar belts can have very different
horsepower rating.
5. lnstall new belts
• Loosen the drive take up and place
the new belts on the pulley. Press
the belts with your hand to position
the slack of each belt on the same
side of the drive. lf the slack is on
different sides. start up loads can
break belt tensile cords.
• Do not pry or force belts onto the
pulleys. This can break the load
carrying tensile cords of the belt
Never use steam or hot water to
clean a refrigerant coil. Dangerous
pressures may be built up by
improper application of heat
resulting in equipment damage oe
personal injury.
WARNING
!
Failure to properly drain and vent
coils when not in use during freezing
temperatures may result in coil
freeze-up damage. Drain and vent
hardware provided by installing
contractor.
CAUTIONS
!
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